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Income Taxes (Reconciliation of Income Taxes at the U.S. Statutory Federal Income Tax Rate) (Detail) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Effective Income Tax Computation [Line Items] |  |  |
U.S. statutory rate | 21.00% | 35.00% | 35.00%
Increases (reductions) resulting from: |  |  |
State taxes, net of federal benefit | 3.30% | 2.90% |
Investment tax credits | (0.90%) | (5.70%) |
Production tax credits | (0.70%) | (0.70%) |
Reversal of excess deferred income taxes | (1.50%) |  |
Federal legislative change | 2.00% |  |
State legislative change | (0.80%) |  |
AFUDC - equity | (0.90%) | (1.30%) |
Other, net | (1.00%) | (2.60%) |
Effective tax rate | 20.50% | 27.60% |
Virginia Electric and Power Company |  |  |
Effective Income Tax Computation [Line Items] |  |  |
U.S. statutory rate | 21.00% | 35.00% |
Increases (reductions) resulting from: |  |  |
State taxes, net of federal benefit | 4.60% | 3.70% |
Investment tax credits | (1.40%) | (0.80%) |
Production tax credits | (0.70%) | (0.50%) |
Reversal of excess deferred income taxes | (1.90%) |  |
Federal legislative change | (0.20%) |  |
AFUDC - equity | (0.50%) | (0.60%) |
Other, net | (0.30%) | 0.20% |
Effective tax rate | 20.60% | 37.00% |
Dominion Energy Gas Holdings, LLC |  |  |
Effective Income Tax Computation [Line Items] |  |  |
U.S. statutory rate | 21.00% | 35.00% |
Increases (reductions) resulting from: |  |  |
State taxes, net of federal benefit | 3.90% | 2.70% |
Reversal of excess deferred income taxes | (1.30%) |  |
Federal legislative change | 2.00% |  |
State legislative change | 0.10% |  |
AFUDC - equity | (0.40%) | (0.80%) |
Other, net | 0.70% | (0.10%) |
Effective tax rate | 26.00% | 36.80% |

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